Children’s visceral organs are fragile, and their morphology and physiological functions are not yet full. As a delicate organ, the lung is most vulnerable to evil. The lung suits dampness but is unaccustomed to dryness and is therefore susceptible to disease caused by dryness evil. In the pathogenesis of mycoplasma pneumoniae pneumonia (MPP) in children, dry cough is the main clinical symptom, which is consistent with the pathogenesis of lung injury caused by dryness evil. MPP in children is caused by dryness evil, and can be divided into two pathological states, namely, deficiency and obstruction of fluid, according to the depth of the disease and the degree of injury to fluid. Based on this, the theory of "flowing fluid to moisten dryness" is proposed. In this theory, moistening is applied to maintain the flow of fluid, so that the meridians can be opened, fluid can be transported, and the organs can be irrigated and nourished. Our team believe that dryness evil injuring the lung fluid and the obstruction of fluid are fundamental factors in the development of MPP in children. External dryness evil attacking the body, internal dryness evil burning the fluid, and evil becoming poisonous over time are key to the de-velopment of MMP. Treatment should consider the physiological and pathological characteristics of the children and be performed under the guidance of the theory of "flowing fluid to moisten dryness, " including applying the moistening method to moisten the lung, nourish the fluid, and dispel the evil. This should be performed in combination with the tonic method, clearing method, and lowering method. By combining multiple method, the lung fluid will be full, the evil will be removed, and the body will become healthy.

flowing fluid to moisten dryness;mycoplasma pneumoniae pneumonia;pediatrics;dryness evil;moistening method